We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
they became interested in the photographic field.
By natural law, such a combination seems to contradict itself, as the increase in general sensitivity is bound to cause increase in graininess. Additional increase in speed can be obtained by various technical methods, but in every instance one or several of other desirable characteristics, representing important factors of a standard negative material might be lost.
Graininess, however, is not in every case in proportionate relation to the original grain size of an enexposed negative emulsion. Different methods of processing a negative or a print therefrom will result in final prints which vary greatly in graininess, although the negative and positive emulsions used are the same. Graininess, in fact, is rather caused by formation of grain clusters during development than by originally large single grain size.
The raw film manufacturer has contributed a very substantial share in experimentally establishing principles and methods which help to avoid excessive graininess. Agfa Ansco is still engaged in further investigating possible improvements in this direction, realizing that any step forward will be highly beneficial, considering particularly the needs of special effect photography, or of any photographic process in general which applies the duplicating principle.
Direct Duplicating Film.
Within the last year, Agfa Ansco has introduced a completely novel type of film which, when exposed in a camera and normally developed, renders a positive instead of a negative. Similarly, if this film type is used as a printing material, the print will be a negative in case the original has been a negative, or will be a positive when printed from a positive.
With its present speed characteristics, this emulsion is not applicable to motion picture photography, as its sensitivity is only within the range of that of average contact printing papers. (See illustration of characteristic curve).
Characteristic curves showing comparison between direct duplicating film, positive 35 mm. film and Convira paper.
Page Eleven